VLAN, Priority and Multicast Engineering for Protection Ethernet Networks
An IEEE 802.1Q and IEC 61850 guide to VLANs, priority queues, Layer-2 multicast, APPID, bandwidth, redundancy and switch acceptance tests.
Category Protection & Control
Protection relays, CTs, VTs, LVCs, secondary circuits, trip systems, automation and communication engineering for medium-voltage switchgear.
IEC 61850 Data Models and Logical Nodes for MV Switchgear Bays
A practical IEC 61850-7-4 model for MV breaker, switch, control, interlock, protection, measurements, quality, SCL and validation.
GOOSE Supervision, Test Modes and Fail-Safe Design for Critical Interlocking
A signal-level guide to GOOSE liveness, quality, simulation, unknown-state logic, safe fallback, overrides and negative testing for MV interlocks.
PTP, SNTP and IRIG-B Time Synchronization in Digital Substations
A practical time-architecture guide for SV alignment, protection, event records and SCADA using PTP, SNTP and IRIG-B with failure testing.
PRP and HSR Network Redundancy: Engineering Beyond Zero Recovery Time
A practical PRP/HSR guide covering DAN/SAN/RedBox/QuadBox roles, bandwidth, latency, time, common-mode failures, cybersecurity and proof testing.
Station Bus Versus Process Bus: Boundaries, Benefits and Failure Modes
A functional comparison of station bus and process bus, including separate, hybrid and converged topologies, failure containment and acceptance tests.
Process-Bus Architecture for MV Switchgear: Merging Units, Sensors and IEDs
A complete MV process-bus architecture guide covering sensors, merging units, breaker I/O, trip paths, time, networks, test isolation and lifecycle.
SCADA and Automation SAT: A Practical End-to-End Verification Checklist
A risk-based site acceptance checklist covering point-to-point, reports, controls, automation, timing, redundancy, security and energization hold points.
The Future of MV Protection: Centralized Relays, Virtualized Protection, Digital Twins and AI-Based Diagnostics
A practical, non-hype assessment of centralized and virtualized MV protection, process interfaces, digital twins, AI diagnostics, reliability, testing and migration.
How to Analyze Protection-Relay Fault Records: COMTRADE, Oscillography and Sequence-of-Events Data
A practical forensic workflow for relay COMTRADE and event records: verify scaling/time, reconstruct fault sequence, calculate phasors and sequences, identify CT saturation and breaker performance.